Tag Archives: bust apex

About the Apex

Fitting a pattern can be a tough process. I made a few muslins of the princess seam bodice.  Size 16 was too big all over.


Size 14 was better, but I’m still not satisfied with the placement of the princess seam.  I thought they were supposed to curve over the the apex,  the fullest part of the bust.  An internet search confirmed that the seam should be over the apex or 1/4 inch to the side.


I think the center panel should be narrower and the side pieces bigger and more curved.  Would a size 12 center work with a size 16 side?  Too many of my clothes are tight at the bust, and I want to avoid the fabric straining and the bust flattening effect.  I did look at princess seam pattern adjustments on the web but found them complicated and confusing.

Then I looked it up in a book I actually own, “The Perfect Fit”, by the editors of Creative Publishing International.


It shows to add 1/4 inch to the fullest part of the curvy side panel for each bra cup size larger than B, and blend the line from the increase mark to points 4 inch above and below the apex.  Then you cut and lengthen the center front piece by the same amount at the corresponding place at the fullest bust level.  Finally something simple and easy to understand!

I didn’t know whether you are supposed to pin fit the muslin, or baste in a zipper, so I cut and sewed it like a pullover and  put it on over my head. I haven’t looked too much at the fit in the back, but I usually have  a horizontal fold of material above the waist which I learned calls for the swayback adjustment.

So what is a good fit?  What do you think about the fit of the second muslin?  Should I keep on experimenting?  I think I will try adding to the curve on the side piece and cut it with a bigger seam allowance on the side seam for fitting.